Last look is a brief acceptance check that some foreign exchange liquidity providers apply after receiving a request to trade against a quoted price. The quote may be visible, yet execution is not final until the provider accepts the request. For institutions routing orders electronically, that distinction can change the effective cost of dealing even when advertised spreads appear competitive.

In forex trading, last-look arrangements are not universal, and their permitted use depends on venue rules and bilateral agreements. Five execution risks deserve attention because a rejected request can affect the next trade, not merely the one that failed.

Price Checks Can Reject Orders During Rapid Market Moves

A provider may compare its original quote with a reference price during the acceptance window. If the market has moved beyond an agreed tolerance, the request may be declined rather than filled at the displayed rate. Around unexpected policy announcements or thin trading sessions, such checks can reject a greater proportion of requests.

The resulting problem is not simply a wider spread. An institution must submit another order after the market has already moved. Evaluate acceptance rates alongside quoted prices, particularly for orders sent during fast conditions.

Rejection Patterns Can Make Cheap Quotes More Expensive

Two providers can advertise equally narrow spreads while delivering different outcomes. One may accept most requests; another may decline disproportionately when its quoted price becomes advantageous to the customer. Measuring only completed fills conceals the requests that failed.

Execution analysis should separate rejection rates when prices move in the customer’s favor from rates when prices move against it. A lower headline spread can be the more expensive choice if repeated rejections force the institution to pursue deteriorating prices elsewhere. Request time-stamped order and rejection data rather than relying on average spread reports.

Routing Delays Can Compound the Cost of a Rejected Request

Imagine a hypothetical institutional purchase of AUD 2 million against the US dollar. A dealer streams an offer of 0.67400, implying a USD 1,348,000 purchase cost. The request is rejected during a rapid rise in AUD/USD. The execution algorithm reroutes the full order to another provider, where the accepted offer is 0.67435.

The institution pays USD 1,348,700, or USD 700 more than the initial quoted cost, excluding fees. The initial price was never an executed transaction, so the difference is an opportunity-cost comparison rather than realized slippage on a fill. The sequence illustrates why a routing algorithm needs clear rules for rejected requests, price limits, and whether to split the replacement order.

Uncertain Acceptance Can Complicate Simultaneous Hedging

Institutional desks sometimes execute related currency transactions close together to reduce exposure. If one leg is accepted immediately while another remains subject to last look, the desk can temporarily hold a position it never intended to carry alone.

That mismatch is especially troublesome for cross-currency hedges or basket transactions during volatile sessions. Even a short acceptance delay can change the price of the outstanding leg. Check whether execution is firm, whether partial acceptance is possible, and how the system handles a failed component before treating paired orders as a completed hedge.

Wholesale Last Look Does Not Automatically Describe Retail CFD Execution

A retail CFD provider may source reference prices from institutions using last look, but the customer’s own order is governed by the CFD provider’s execution policy. Wholesale rejection statistics therefore cannot establish whether a particular retail order will be rejected, requoted, or filled at another price.

For forex trading through CFDs, the relevant evidence is the provider’s treatment of market orders, slippage, and liquidity interruptions. Before opening a currency CFD, examine its execution disclosures, calculate the loss if an entry or exit occurs several pips beyond the displayed quote, and verify whether any advertised price is firm or merely indicative.